25 As a transverse wave travels through a medium, the individual particles of the medium move

(1) perpendicular to the direction of wave travel(2) parallel to the direction of wave travel(3) in circles(4) in ellipses

26 A straight glass rod appears to bend when placed in a beaker of water, as shown in the diagram below.

What is the best explanation for this phenomenon?

(1) The water is warmer than the air.(2) Light travels faster in water than in air.(3) Light is reflected at the air-water interface.(4) Light is refracted as it crosses the air-water

27 What happens to the speed and frequency of a light ray when it passes from air into water?

(1) The speed decreases and the frequency increases.(2) The speed decreases and the frequency remains the same.(3) The speed increases and the frequency increases.(4) The speed increases and the frequency remains the same.

28 Parallel wave fronts incident on an opening in a barrier are diffracted. For which combination of wavelength and size of opening will diffraction effects be greatest?

(1) short wavelength and narrow opening(2) short wavelength and wide opening(3) long wavelength and narrow opening(4) long wavelength and wide opening

29 Which wave phenomenon occurs when vibrations in one object cause vibrations in a second object?

(1) reflection(2) resonance(3) intensity(4) tuning

30 A photon having an energy of 9.40 electronvolts strikes a hydrogen atom in the ground state. Why is the photon not absorbed by the hydrogen atom?

(1) The atom’s orbital electron is moving too fast.(2) The photon striking the atom is moving too fast.(3) The photon’s energy is too small.(4) The photon is being repelled by electrostatic force.

31 Metal sphere A has a charge of –2 units and an identical metal sphere, B, has a charge of –4 units. If the spheres are brought into contact with each other and then separated, the charge on sphere B will be

(1) 0 units(2) –2 units(3) –3 units(4) +4 units

32 A photon of light traveling through space with a wavelength of 6.0 × 10–7 meter has an energy of

(1) 4.0 × 10–40 J(2) 3.3 × 10–19 J(3) 5.4 × 1010 J(4) 5.0 × 1014 J

33 What is the net electrical charge on a magnesium ion that is formed when a neutral magnesium atom loses two electrons?